Forty-two people were executed in the United States in 2007.
Holton, who waived his appeals and chose the electric chair, was the first person to be electrocuted by the state of Tennessee since 1960.
The state of South Dakota carried out its first execution since 1947.
In September 2007, executions in the United States were halted, due to certiorari in Baze v. Rees, which questioned the constitutionality of lethal injection.
The U.S. Supreme Court stayed all executions until a decision was made.